Porous polymer flat-sheet membrane
US-2015328591-A1 · Nov 19, 2015 · US
Moisture permeable filter medium
US9770692B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9770692-B2 |
| Application number | US-201415107821-A |
| Country | US |
| Kind code | B2 |
| Filing date | Nov 26, 2014 |
| Priority date | Dec 27, 2013 |
| Publication date | Sep 26, 2017 |
| Grant date | Sep 26, 2017 |
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Abstract
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Provided is a moisture permeable filter medium formed by laminating a hydrophobic layer having hydrophobicity and a hydrophilic layer having hydrophilicity together, in which one of the hydrophobic layer and the hydrophilic layer is composed of a PTFE porous film formed using PTFE, and the other of the hydrophobic layer and the hydrophilic layer is composed of an air permeable sheet to which air is permeable.
First claim
Opening claim text (preview).
The invention claimed is: 1. A moisture permeable filter medium that is formed into a sheet so that water vapor is permeable from at least one surface side to the other surface side, the moisture permeable filter medium comprising: a hydrophobic layer having hydrophobicity and a hydrophilic layer having hydrophilicity that are laminated together, wherein one of the hydrophobic layer and the hydrophilic layer is composed of a PTFE porous film using PTFE, the other of the hydrophobic layer and the hydrophilic layer is composed of an air permeable sheet to which air is permeable, and the hydrophobic layer has a water absorption coefficient of less than 0.01%, and the hydrophilic layer has a water absorption coefficient of 0.01% or more. 2. The moisture permeable filter medium according to claim 1 , wherein the air permeable sheet is formed using at least one sheet of non-woven fabrics, and the air permeable sheet has a thickness of 20 μm or more and 1000 μm or less. 3. The moisture permeable filter medium according to claim 1 , wherein the hydrophobic layer and the hydrophilic layer are laminated to be in contact with each other. 4. The moisture permeable filter medium according to claim 1 , wherein the water absorption coefficient of the hydrophilic layer is 0.03% or more and 30% or less.
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Classifications
by filtration · CPC title
Drying gases or vapours · CPC title
Hydrophobic membranes · CPC title
characterised by their properties · CPC title
Characteristic thickness · CPC title
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- What does patent US9770692B2 cover?
- Provided is a moisture permeable filter medium formed by laminating a hydrophobic layer having hydrophobicity and a hydrophilic layer having hydrophilicity together, in which one of the hydrophobic layer and the hydrophilic layer is composed of a PTFE porous film formed using PTFE, and the other of the hydrophobic layer and the hydrophilic layer is composed of an air permeable sheet to which ai…
- Who is the assignee on this patent?
- Nitto Denko Corp
- What technology area does this patent fall under?
- Primary CPC classification B01D71/36. Mapped technology areas include Operations & Transport.
- When was this patent published?
- Publication date Tue Sep 26 2017 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 2 related publications on this page (citations in our corpus or others sharing the same primary CPC).